Comfort-Aire HBH Series 1/2 to 5 Ton - Manual (Page 19)

Heat Controller, Inc. HBH/V COMPACT IOM Instructions
Water Quality Standards
Table 3: Water Quality Standards
WaterÊQuality
Parameter
HX
Material
Closed
Recirculating
OpenÊLoopÊandÊRecirculatingÊWell
ScalingÊPotentialÊ-ÊPrimaryÊMeasurement
pH/CalciumÊHardness
All
-
pHÊ<Ê7.5ÊandÊCaÊHardnessÊ<100ppm
Method
IndexÊLimitsÊforÊProbableÊScalingÊSituationsÊ-Ê
(OperationÊoutsideÊtheseÊlimitsÊisÊnotÊrecommended)
Ryznar
All
- 6.0К-К7.5
StabilityÊIndex IfÊ>7.5ÊminimizeÊsteelÊpipeÊuse.
Langelier
All
- -0.5ÊtoÊ+0.5
SaturationÊIndex
IfÊ<-0.5ÊminimizeÊsteelÊpipeÊuse.ÊBasedÊuponÊ150¡FÊ[66¡C]ÊHWGÊand
DirectÊwell,Ê85¡FÊ[29¡C]ÊIndirectÊWellÊHX
IronÊFouling
IronÊFe 2+ (Ferrous)
All
-
<0.2ÊppmÊ(Ferrous)
(BacterialÊIronÊpotential) IfÊFe 2+ Ê(ferrous)>0.2ÊppmÊwithÊpHÊ6К-К8,КO2<5ÊppmÊcheckÊforÊironÊbacteria
IronÊFouling All
- <0.5ÊppmÊofÊOxygen
AboveÊthisÊlevelÊdepositionÊwillÊoccur.
CorrosionÊPrevention
pH All
6К-К8.5
6К-К8.5
Monitor/treatÊas
needed
MinimizeÊsteelÊpipeÊbelowÊ7ÊandÊnoÊopenÊtanksÊwithÊpHÊ<8
HydrogenÊSulfideÊ(H
2
S)
All
- <0.5Êppm
AtÊH
2
S>0.2Êppm,ÊavoidÊuseÊofÊcopperÊandÊcopperÊnickelÊpipingÊorÊHX's.
RottenÊeggÊsmellÊappearsÊatÊ0.5ÊppmÊlevel.
CopperÊalloyÊ(bronzeÊorÊbrass)ÊcastÊcomponentsÊareÊOKÊtoÊ<0.5Êppm.
AmmoniaÊionÊasÊhydroxide,Êchloride,Ê
nitrateÊandÊsulfateÊcompounds
All
-
<0.5Êppm
Maximum
MaximumÊAllowableÊatÊmaximumÊwaterÊtemperature.
ChlorideÊLevels
50¡FÊ(10¡C) 75¡FÊ(24¡C) 100ϒF (38ϒC)
Copper - <20ppm NR NR
CuproNickel - <150Êppm NR NR
304ÊSS - <400Êppm <250Êppm <150 ppm
316ÊSS - <1000Êppm <550Êppm < 375 ppm
Titanium - >1000Êppm >550Êppm >375 ppm
ErosionÊandÊClogging
ParticulateÊSizeÊand
Erosion
All
<10ÊppmÊofÊparticles
andÊaÊmaximum
velocityÊofÊ6ÊfpsÊ[1.8Êm/s].
FilteredÊforÊmaximum
800ÊmicronÊ[800mm,
20Êmesh]Êsize.
<10ÊppmÊ(<1ÊppmÊ"sandfree"ÊforÊreinjection)ÊofÊparticlesandÊaÊmaximum
velocityÊofÊ6ÊfpsÊ[1.8Êm/s].ÊFilteredÊforÊmaximumÊ800ÊmicronÊ[800mm,
20Êmesh]Êsize.AnyÊparticulateÊthatÊisÊnotÊremovedÊcanÊpotentially
clogÊcomponents.
Notes:
Rev.: 01/21/09B
• NR - Application not recommended.
• "-" No design Maximum.
• Closed Recirculating system is identified by a closed pressurized piping system.
• Recirculating open wells should observe the open recirculating design considerations.
AboveÊtheÊgivenÊlimits,ÊscalingÊisÊlikelyÊtoÊoccur.ÊÊScalingÊindexesÊshouldÊbeÊcalculatedÊusingÊtheÊlimitsÊbelow
ScalingÊindexesÊshouldÊbeÊcalculatedÊatÊ150¡FÊ[66¡C]ÊforÊdirectÊuseÊandÊHWGÊapplications,ÊandÊatÊ90¡FÊ[32¡C]ÊforÊindirectÊHXÊuse.Ê
AÊmonitoringÊplanÊshouldÊbeÊimplemented.